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20 questions
The atomic number of oxygen is
8
15.9994
16
O
Identify the elements in this compound.
Carbon, Helium, Oxygen
Chromium, Hydrogen, Oxygen
Calcium, Hydrogen, Oxygen
Carbon, Hydrogen, Oxygen
The number of electrons in a Lithium atom is
3
4
6
7
The opposite phase of melting is
Condensation
Vaporization
Sublimation
Freezing
Electrons are
Positively charged particles
Negatively charged particles
Neutral
If an atom has 3 electrons, how many protons does it have?
1
2
3
4
A group of elements that are shiny, conduct heat and electricity well is called
Metals
Non-metals
Metalloids
What is made up two or more elements that are chemically combined?
Atom
Element
Compound
Mixture
Which of these is a property of metals?
Malleable
Very brittle
Can't conduct electricity
What does the nucleus of an atom contain?
Electrons and neutrons
Protons and neutrons
Electrons and protons
DNA
Which is an example of an heterogenous mixture?
soy sauce
salad
tea
guacamole
Metals are located on what size of the periodic table?
left
right
the stairway
the bottom
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